This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N = 5e5 + 5, INF = 1e18 + 7;
int n, a[N], b[N], d[N], pre[N];
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n;
for(int i = 1; i <= n; i++) cin >> a[i] >> b[i], d[i] = a[i] - b[i], pre[i] = pre[i - 1] + d[i];
priority_queue<int> pq;
int ans = 0;
for(int i = 1; i <= n - 1; i++){
pq.push(pre[i]); pq.push(pre[i]);
ans = ans + max(0LL, min(pq.top(), pre[n])) - pre[i];
pq.pop();
}
cout << ans << '\n';
return 0;
}
/*
7
2 0
2 0
2 0
0 5
2 0
2 0
2 0
6
1 2
0 0
2 0
0 0
0 0
0 1
*/
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